MXZ-4C36NAHZ / MXZ-5C42NAHZ / MXZ-8C48NAHZ Technical & Service Manual - Revised Edition - Outdoor Unit MXZ Branch Box

Q: What safety steps must be followed before accessing terminals?

Before obtaining access to terminal, all supply circuit must be disconnected.

Q: Why must new pipes and cleaned refrigerant piping be used for R410A?

Inside and outside of the piping must be clean and free of sulfur, oxides, dirt, and shaving particles to prevent contamination that can deteriorate refrigerant oil and affect system performance.

Q: How should refrigerant be charged for R410A to avoid composition change?

Charge refrigerant from the liquid phase of the gas cylinder; charging from gas phase can change refrigerant composition and lower efficiency.

Oct 22, 2026

Uploaded by miaandmiso

Technical & service manual for outdoor units covering model series MXZ-4C36NAHZ, MXZ-5C42NAHZ, MXZ-8C48NAHZ and related service references, including specifications, wiring, troubleshooting, and system construction conditions. Emphasis is placed on safety precautions and procedures for handling the R410A refrigerant, including pipe cleanliness, suitable ester/ether/alkylbenzene oil usage, leak prevention, vacuum practices, tool requirements, and correct refrigerant charging methods. Includes relevant parts catalog references for branch boxes.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages164

Reading Time6 h 53 min

AccessFree to download

SAFETY PRECAUTION

ALWAYS OBSERVE FOR SAFETY

CAUTIONS RELATED TO NEW REFRIGERANT

TECHNICAL CHANGES

Service ref. change overview

63/,7􀀐7<3(􀀏 +($7 3803 $,5 &21',7,21(56 HFC utilized R410A Februray 2018 No. OCH573 REVISED EDITION-E TECHNICAL & SERVICE MANUAL [Model Name] MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA MXZ-8C60NA PAC-MKA50BC PAC-MKA30BC PAC-MKA51BC PAC-MKA31BC [Service Ref.] MXZ-4C36NAHZ MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ MXZ-8C48NAHZ-U1 MXZ-8C48NA MXZ-8C48NA-U1 MXZ-8C60NA-U1 PAC-MKA50BC PAC-MKA30BC PAC-MKA51BC PAC-MKA31BC 5HYLVLRQ: 􀂇 &RUUHFWHG WKH GHVFULSWLRQ RIRXWGRRU SRZHU FLUFXLW ERDUGLQ SDJH 􀀔􀀕􀀕 DQG WKH PRGHOVHOHFWLRQ LQ SDJH 􀀔􀀕􀀘 LQ 5(9,6(' (',7,21􀀐(􀀑 􀂇 6RPH GHVFULSWLRQV KDYHEHHQ PRGLILHG􀀑 2&+􀀘􀀚􀀖 5(9,6(' (',7,21􀀐'LV YRLG􀀑 Notes: 􀂇 7KLV VHUYLFH PDQXDOGHVFULEHV WHFKQLFDO GDWD RIRXWGRRU XQLW DQG EUDQFK ER[􀀑$V IRU LQGRRU XQLWV􀀏 UHIHU WRLWV VHUYLFH PDQXDO􀀑 􀂇 5R+6 FRPSOLDQW SURGXFWV KDYH *! PDUN RQ WKH VSHF QDPH SODWH􀀑 CONTENTS TECHNICAL CHANGES......................................... 2 1. SAFETY PRECAUTION....................................3 2. OVERVIEW OF UNITS......................................6 0RGHO QDPH 3. SPECIFICATIONS............................................10 LQGLFDWLRQ 4. DATA................................................................14 5. OUTLINES AND DIMENSIONS......................36 6. WIRING DIAGRAM......................................... 40 7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION.... 47 8. TROUBLESHOOTING.................................... 52 9. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE....141 OUTDOOR UNIT: MXZ-4C36NAHZ 10. DISASSEMBLY PROCEDURE......................142 PARTS CATALOG (OCB573) BRANCH BOX: PAC-MKA51BC TECHNICAL CHANGES Service ref. have been changed as follows. MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1 􀂇 7KH VKDSH RI SLSLQJ DURXQG D VWRS YDOYH 􀀋7􀀚: (􀀓􀀗 􀀗􀀔􀀓􀀌 KDV EHHQ FKDQJHG􀀑 􀂇 7KH VKDSH RI YDOYH EHG KDV EHHQ FKDQJHG􀀑 OCH573E 􀀕 | 1 | SAFETY PRECAUTION | | --- | --- | 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuit must be disconnected. 1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes. | Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness. | | --- | | Contamination inside refrigerant piping can cause deterioration of refrigerant oil, etc. | | Store the piping indoors, and keep both ends of the piping sealed until just before brazing.(Leave elbow joints, etc. in their packaging.) | | --- | | If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor. | | The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount. | | --- | | If large amount of mineral oil enters, that can cause deterioration of refrigerant oil, etc. | | Charge refrigerant from liquid phase of gas cylinder. | | --- | | If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered. | | Do not use refrigerant other than R410A. | | --- | | If other refrigerant (R22, etc. ) is used, chlorine in refrigerant can cause deterioration of refrigerant oil, etc. | | Use a vacuum pump with a reverse flow check valve. | | --- | | Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc. | | Use the following tools specifically designed for use with R410A refrigerant. | | --- | | The following tools are necessary to use R410A refrigerant.
Tools for R410A Gauge manifold Flare tool Charge hose Size adjustment gauge Gas leak detector Vacuum p

FAQs

What safety steps must be followed before accessing terminals?

Before obtaining access to terminal, all supply circuit must be disconnected.

Why must new pipes and cleaned refrigerant piping be used for R410A?

Inside and outside of the piping must be clean and free of sulfur, oxides, dirt, and shaving particles to prevent contamination that can deteriorate refrigerant oil and affect system performance.

How should refrigerant be charged for R410A to avoid composition change?

Charge refrigerant from the liquid phase of the gas cylinder; charging from gas phase can change refrigerant composition and lower efficiency.

Oct 22, 2026

Uploaded by miaandmiso